Good morning folks, last night I spent some time trying to image Jupiter for the first time and all I could get is what looked like an extremely over-exposed, white disk. Here's the equipment:Celestron 8" CPCCanon 50dNot using a BarlowBackyard EOSRegistax

I was using the planetary mode in EOS to write video, about 400 frames. I tried iso settings from 200 to 1600. Even just looking at it in EOS it was just a white ball with none of the detail I could see using an eyepiece. Focus was good. No amount of histogram stretching was helping.

Do I need a filter to knock the brightness down? I can't imagine that dropping iso to 100 is going to help much. Or, is there something else I'm doing wrong?

It's best to use lowest ISO (100?) with planets.
Don't know if you can adjust exposure with 50D/video but if you can then you should do that.
Magick Lantern can do this but this is another matter and maybe you should try something else first.http://magiclantern....n_Firmware_Wiki

Use a barlow, don't stretch histogram. Generally, I don't use a DSLR to get video. But, on my Olympus, I can adjust my shutter speed for video mode and keep image from being "over-exposed." And, my camera only has 2 frame rates for video mode. Jerry Lodriguss and some others have tutorials for imaging with a DSLR, whether it is planets or deep sky.